Why is regeneration is so effective in some animals while missing in others?

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"Regeneration is the growth of new tissue or organs to replace those lost or damaged through injury. All animals and plants are capable of regeneration to some extent but, as a general rule, the more highly evolved an animal is, the less are its powers of regeneration."

"Regenerative capacity is...

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"Regeneration is the growth of new tissue or organs to replace those lost or damaged through injury. All animals and plants are capable of regeneration to some extent but, as a general rule, the more highly evolved an animal is, the less are its powers of regeneration."

"Regenerative capacity is inversely related to complexity."  So the more complex a being is, the more difficult it will be to regenerate an appendage.  Newts and flatworms can easily regenerate body parts due to their biological simplicity.  Human on the other hand can regenerate, but not as fantastically as lower life forms.  Humans can regenerate skin, bones (repair of fractures), the liver, and even the adrenal glands.

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